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Own systems · 2026

IoT device on ESP32-S3 with a screen simulator

Firmware for a hardware panel: system status, alerts and commands under a rotary knob, connected over Bluetooth LE.

In daily use

Knob control: tile menu, server and CPU chart, virtual machines, firewall restart with a PIN; simulator recording, sample data

A recording and screenshots from the screen simulator: the same code as the firmware, labels translated to Polish, sample data (made-up services and track); the 320×170 screen shown at 3:1 in the recording and 4:1 in the screenshots, section scrolling between the chart and the machine list cut from the recording.

Task

A physical panel was needed to watch alerts and trigger quick actions, without storing any passwords on the device.

Solution

C++ firmware with an encrypted Bluetooth LE service. The server runs only allow-listed commands, and critical actions require a PIN. The simulator compiles the same code on a computer and compares screenshots on every build.

Result

Over 1,800 commits
9.2 h on battery with the screen on
Every UI change verified with screenshots
No Wi-Fi and no passwords on the device

My role

Device design, firmware, server-side service and tests.

Stack

C++ESP32-S3PlatformIOBluetooth LEPython

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